[PATCH net-next] ptp: Remove 'default y' for VMCLOCK PTP device
From: David Woodhouse <dwmw2@infradead.org>
Date: 2024-11-02 21:52:33
Also in:
linux-arm-kernel, linux-rtc, lkml, qemu-devel, virtualization
Subsystem:
networking drivers, ptp hardware clock support, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Richard Cochran, Linus Torvalds
From: David Woodhouse <redacted> The VMCLOCK device gives support for accurate timekeeping even across live migration, unlike the KVM PTP clock. To help ensure that users can always use ptp_vmclock where it's available in preference to ptp_kvm, set it to 'default PTP_1588_CLOCK_VMCLOCK' instead of 'default y'. Signed-off-by: David Woodhouse <redacted> --- drivers/ptp/Kconfig | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/ptp/Kconfig b/drivers/ptp/Kconfig
index e98c9767e0ef..ed087ae75f0e 100644
--- a/drivers/ptp/Kconfig
+++ b/drivers/ptp/Kconfig@@ -135,12 +135,16 @@ config PTP_1588_CLOCK_VMCLOCK tristate "Virtual machine PTP clock" depends on X86_TSC || ARM_ARCH_TIMER depends on PTP_1588_CLOCK && ACPI && ARCH_SUPPORTS_INT128 - default y + default PTP_1588_CLOCK_KVM help This driver adds support for using a virtual precision clock advertised by the hypervisor. This clock is only useful in virtual machines where such a device is present. + Unlike the KVM virtual PTP clock, the VMCLOCK device offers support + for reliable timekeeping even across live migration. So this driver + is enabled by default whenever the KVM PTP clock is. + To compile this driver as a module, choose M here: the module will be called ptp_vmclock.
--
2.44.0
Attachments
- smime.p7s [application/pkcs7-signature] 5965 bytes